According to Madam Pomfrey, thoughts could leave deeper scars than almost anything else.
J. K. Rowling'It was stupid, thinking it was him, I mean, I knew he was dead' Harry muttered. 'You think the dead we loved ever truly leave us? You think that we don't recall them more clearly than ever in times of great trouble? Your father is alive in you, Harry, and shows himself most plainly when you have need of him....You know, Harry, in a way you did see your father last night....You found him inside yourself.'
J. K. RowlingThe exceptions were two men a little ahead of them, standing just outside the Three Broomsticks. One was very tall and thin; squinting through his rain-washed glasses Harry recognized the barman who worked in the other Hogsmeade pub, the Hogโs Head. As Harry, Ron, and Hermione drew closer, the barman drew his cloak more tightly around his neck and walked away, leaving the shorter man to fumble with something in his arms. They were barely feet from him when Harry realized who the man was. โMundungus!
J. K. Rowling